Plastic barrel, lens module and electronic device

ABSTRACT

A plastic barrel includes an object-end portion, an image-end portion, an inner tube portion and a plurality of protrusions. The object-end portion includes an outer object-end surface, an object-end hole and an inner annular object-end surface. One side of the inner annular object-end surface is connected to the outer object-end surface and surrounds the object-end hole. The image-end portion includes an outer image-end surface, an image-end opening and an inner annular image-end surface. The inner annular image-end surface is connected to the outer image-end surface and surrounds the image-end opening. The inner tube portion connects the object-end portion and the image-end portion and includes a plurality of inclined surfaces. The protrusions are disposed at least on one of the inner annular object-end surface, the inner annular image-end surface and the inclined surfaces, wherein the protrusions are regularly arranged around the central axis of the plastic barrel.

RELATED APPLICATIONS

The present application is a continuation of the application Ser. No.16/431,945, filed on Jun. 5, 2019, which is a continuation of theapplication Ser. No. 16/360,159, filed on Mar. 21, 2019, which is acontinuation of the application Ser. No. 14/970,696, filed on Dec. 16,2015, PAT 10,281,676 issued on May 7, 2019, and claims priority toTaiwan application serial number 104217937, filed on Nov. 9, 2015, theentire contents of which are hereby incorporated herein by reference.

BACKGROUND Technical Field

The present disclosure relates to a plastic barrel and a lens module.More particularly, the present disclosure relates to a plastic barreland a lens module which are applicable to portable electronic devices.

Description of Related Art

Due to the popularity of personal electronic products and mobilecommunication products having camera functionalities, such as smartphones and tablet personal computers, the demand for compact imagingapparatuses has been increasing, and the requirements for highresolution and image quality of present compact imaging apparatusesincrease significantly.

A plastic barrel is generally used to carry a lens module and provide anoptical space between any two lens elements thereof. A surface propertyof the plastic barrel relates to an effect of suppressing thenon-imaging light. Accordingly, an image quality of the lens module isinfluenced by the surface property of the plastic barrel.

A conventional plastic barrel is typically formed by an injectionmolding method and has a smooth and bright surface, which is featuredwith high reflectivity. As a result, the non-imaging light reflectedfrom the aforementioned surface of the conventional plastic barrelcannot be effectively attenuated.

Another conventional plastic barrel is provided for suppressing thenon-imaging light. The conventional plastic barrel is atomized with asurface treatment, so that a reflectivity thereof is reduced. However,the effect of suppressing the non-imaging light is still limited.Therefore, the conventional plastic barrel cannot satisfy therequirements of high-end optical systems with camera functionalities.

Given the above, how to improve the surface property of the plasticbarrel for enhancing the image quality of compact lens modules hasbecome one of the important subjects.

SUMMARY

According to one aspect of the present disclosure, a plastic barrelincludes an object-end portion, an image-end portion, an inner tubeportion and a plurality of protrusions. The object-end portion includesan outer object-end surface, an object-end hole and an inner annularobject-end surface. One side of the inner annular object-end surface isconnected to the outer object-end surface and surrounds the object-endhole. The image-end portion includes an outer image-end surface, animage-end opening and an inner annular image-end surface. The innerannular image-end surface is connected to the outer image-end surfaceand surrounds the image-end opening. The inner tube portion connects theobject-end portion and the image-end portion and includes a plurality ofinclined surfaces. Each of the inclined surfaces has an angle with acentral axis of the plastic barrel. The protrusions are disposed atleast on one of the inner annular object-end surface, the inner annularimage-end surface and the inclined surfaces, wherein the protrusions areregularly arranged around the central axis of the plastic barrel.

According to another aspect of the present disclosure, a lens moduleincludes the plastic barrel according to the foregoing aspect and anoptical lens assembly, which is disposed in the plastic barrel andincludes a plurality of lens elements.

According to another aspect of the present disclosure, an electronicdevice includes the lens module according to the foregoing aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic view of a plastic barrel according to the 1stembodiment of the present disclosure;

FIG. 1B shows a schematic view of the protrusions of the plastic barrelaccording to the 1st embodiment;

FIG. 1C shows a schematic view of the parameters w and h of the plasticbarrel according to the 1st embodiment;

FIG. 2A is a schematic view of a plastic barrel according to the 2ndembodiment of the present disclosure;

FIG. 2B shows a schematic view of the protrusions of the plastic barrelaccording to the 2nd embodiment;

FIG. 2C shows a schematic view of the parameters w and h of the plasticbarrel according to the 2nd embodiment;

FIG. 3A is a schematic view of a plastic barrel according to the 3rdembodiment of the present disclosure;

FIG. 3B shows a schematic view of the protrusions of the plastic barrelaccording to the 3rd embodiment;

FIG. 3C shows a schematic view of the parameters w and h of the plasticbarrel according to the 3rd embodiment;

FIG. 4A is a schematic view of a plastic barrel according to the 4thembodiment of the present disclosure;

FIG. 4B shows a schematic view of the protrusions of the plastic barrelaccording to the 4th embodiment;

FIG. 4C shows a schematic view of the parameter w of the plastic barrelaccording to the 4th embodiment;

FIG. 5A is a schematic view of a plastic barrel according to the 5thembodiment of the present disclosure;

FIG. 5B shows a schematic view of the parameter w of the plastic barrelaccording to the 5th embodiment;

FIG. 6 shows a lens module according to the 6th embodiment of thepresent disclosure;

FIG. 7 shows an electronic device according to the 7th embodiment of thepresent disclosure;

FIG. 8 shows an electronic device according to the 8th embodiment of thepresent disclosure; and

FIG. 9 shows an electronic device according to the 9th embodiment of thepresent disclosure.

DETAILED DESCRIPTION 1st Embodiment

FIG. 1A is a schematic view of a plastic barrel 100 according to the 1stembodiment of the present disclosure, and FIG. 1B shows a schematic viewof a plurality of protrusions 140 of the plastic barrel 100 according tothe 1st embodiment. In FIG. 1A and FIG. 1B, the plastic barrel 100includes an object-end portion 110, an image-end portion 120, an innertube portion 130 and the protrusions 140.

The object-end portion 110 includes an outer object-end surface 112, anobject-end hole 111 and an inner annular object-end surface 115. Theouter object-end surface 112 is the surface of the plastic barrel 100facing an object (not shown). One side of the inner annular object-endsurface 115 is connected to the outer object-end surface 112 andsurrounds the object-end hole 111.

The image-end portion 120 includes an outer image-end surface 122, animage-end opening 121 and an inner annular image-end surface 125. Theouter image-end surface 122 is the surface of the plastic barrel 100facing an image surface (not shown). The inner annular image-end surface125 is connected to the outer image-end surface 122 and surrounds theimage-end opening 121.

The inner tube portion 130 connects the object-end portion 110 and theimage-end portion 120, wherein the inner tube portion 130 surrounds acentral axis of the plastic barrel 100 and faces the central axis. Theinner tube portion 130 includes a plurality of inclined surfaces 136,wherein each of the inclined surfaces 136 has an angle with the centralaxis, which is greater than 0 degrees and less than 90 degrees. In otherwords, each of the inclined surfaces 136 is neither parallel nororthogonal to the central axis of the plastic barrel 100.

The protrusions 140 are disposed at least on one of the inner annularobject-end surface 115, the inner annular image-end surface 125 and theinclined surfaces 136, wherein the protrusions 140 are regularlyarranged around the central axis of the plastic barrel 100. Therefore,it is favorable for effectively attenuating the non-imaging lightreflected from the aforementioned surface so as to improve the imagequality of the lens module. In the 1st embodiment, the inner annularobject-end surface 115 has a circumferential direction around thecentral axis of the plastic barrel 100, wherein the protrusions 140 withthe same geometric structures are disposed on the inner annularobject-end surface 115, and regularly arranged with the same spaces inthe circumferential direction around the central axis of the plasticbarrel 100. Furthermore, in other embodiments (not shown), theprotrusions can be disposed on the inner annular object-end surface, theinner annular image-end surface, the inclined surfaces or a combinationof the foregoing, wherein the protrusions are regularly arranged aroundthe central axis of the plastic barrel.

In details, the protrusions 140 and the plastic barrel 100 can be formedintegrally. Therefore, it is favorable for maintaining the manufacturingconveniences of the plastic barrel 100.

The object-end portion 110 can further include an inner object-endsurface 113 connected to the other side of the inner annular object-endsurface 115, wherein the inner object-end surface 113 is disposedcorrespondingly to the outer object-end surface 112. Furthermore, theprotrusions 140 can be disposed on the inner annular object-end surface115 and near the outer object-end surface 112. Therefore, it isfavorable for effectively attenuating the non-imaging light reflectedfrom the inner annular object-end surface 115 so as to improve the imagequality of the lens module. In the 1st embodiment, the protrusions 140are disposed on the inner annular object-end surface 115 and near theouter object-end surface 112.

A number of the protrusions 140 can be greater than or equal to 80, andsmaller than or equal to 800. Therefore, it is favorable for maintainingthe denseness of the protrusions 140 so as to enhance the attenuationamplitude of the non-imaging light.

FIG. 1C shows a schematic view of the parameters w and h of the plasticbarrel 100 according to the 1st embodiment. In FIG. 1C, when a width ofeach of the protrusions 140 in the circumferential direction of theplastic barrel 100 is w, the following condition can be satisfied: 0.01mm<w<0.05 mm. Therefore, it is favorable for increasing the roughness ofthe inner annular object-end surface 115 so as to diverge thenon-imaging light.

In FIG. 1C, when a height of each of the protrusions 140 is h, thefollowing condition can be satisfied: 0.01 mm<h<0.06 mm. Therefore, itis favorable for increasing the unevenness of the inner annularobject-end surface 115 so as to attenuate the non-imaging light.

In FIG. 1A, an outer diameter of the object-end portion 110 can besmaller than an outer diameter of the image-end portion 120. Therefore,it is favorable for maintaining the uniformity of thickness of theplastic barrel 100 so as to enhancing the dimensional accuracy of theplastic barrel 100. Furthermore, in FIG. 1A, the inner annular image-endsurface 125 can have an angle with the central axis of the plasticbarrel 100, which is greater than 0 degrees and less than 90 degrees. Inother words, the inner annular image-end surface 125 is neither parallelnor orthogonal to the central axis of the plastic barrel 100.

In FIG. 1A, the inner tube portion 130 can further include a pluralityof parallel surfaces 137 parallel to the central axis of the plasticbarrel 100, wherein a number of the parallel surfaces 137 is at leastsix. Therefore, it is favorable for allowing the plastic barrel 100 tocarry more lens elements and avoiding the disorder among the lenselements during assembling.

In FIG. 1B and FIG. 1C, the plastic barrel 100 can further include atleast two gate traces 150 symmetrically disposed around the central axisof the plastic barrel 100. Therefore, it is favorable for reducing thedefects from the injection molding process such as short shot or sinkmark so as to enhance the manufacturing yield rate of the plastic barrel100. In the 1st embodiment, a number of the gate traces 150 is four,wherein the gate traces 150 are symmetrically disposed around thecentral axis of the plastic barrel 100.

In FIG. 1A, the object-end portion 110 can further include an outerannular object-end surface 114, wherein the outer annular object-endsurface 114 is connected to the outer object-end surface 112 andsurrounds the object-end hole 111, and a distance between the outerannular object-end surface 114 and the central axis is greater than adistance between the inner annular object-end surface 115 and thecentral axis. In FIG. 1C, the gate traces 150 are disposed on the outerannular object-end surface 114. Therefore, it is favorable forsimplifying the mold design of the plastic barrel 100 so as to improvethe production efficiency.

The data of the aforementioned parameters of the plastic barrel 100according to the 1st embodiment of the present disclosure are listed inthe following Table 1, wherein the parameters are also shown as FIG. 1C.

TABLE 1 1st Embodiment w (mm) 0.02 h (mm) 0.02

2nd Embodiment

FIG. 2A is a schematic view of a plastic barrel 200 according to the 2ndembodiment of the present disclosure, and FIG. 2B shows a schematic viewof a plurality of protrusions 240 of the plastic barrel 200 according tothe 2nd embodiment. In FIG. 2A and FIG. 2B, the plastic barrel 200includes an object-end portion 210, an image-end portion 220, an innertube portion 230 and the protrusions 240.

The object-end portion 210 includes an outer object-end surface 212, anobject-end hole 211 and an inner annular object-end surface 215. Theouter object-end surface 212 is the surface of the plastic barrel 200facing an object (not shown). One side of the inner annular object-endsurface 215 is connected to the outer object-end surface 212 andsurrounds the object-end hole 211.

The image-end portion 220 includes an outer image-end surface 222, animage-end opening 221 and an inner annular image-end surface 225. Theouter image-end surface 222 is the surface of the plastic barrel 200facing an image surface (not shown). The inner annular image-end surface225 is connected to the outer image-end surface 222 and surrounds theimage-end opening 221.

The inner tube portion 230 connects the object-end portion 210 and theimage-end portion 220, wherein the inner tube portion 230 surrounds acentral axis of the plastic barrel 200 and faces the central axis. Theinner tube portion 230 includes a plurality of inclined surfaces 236,wherein each of the inclined surfaces 236 has an angle with the centralaxis, which is greater than 0 degrees and less than 90 degrees. In otherwords, each of the inclined surfaces 236 is neither parallel nororthogonal to the central axis of the plastic barrel 200.

In the 2nd embodiment, the inner annular object-end surface 215 has acircumferential direction around the central axis of the plastic barrel200, wherein the protrusions 240 with the same geometric structures aredisposed on the inner annular object-end surface 215, and regularlyarranged with the same spaces in the circumferential direction aroundthe central axis of the plastic barrel 200. FIG. 2C shows a schematicview of the parameters w and h of the plastic barrel 200 according tothe 2nd embodiment. In FIG. 2B and FIG. 2C, each of the protrusions 240includes at least one stepped surface. Therefore, it is favorable foreffectively attenuating the non-imaging light reflected from the innerannular object-end surface 215 so as to further improve the imagequality of the lens module.

In the 2nd embodiment, the protrusions 240 and the plastic barrel 200are formed integrally. Furthermore, the object-end portion 210 furtherincludes an inner object-end surface 213 connected to the other side ofthe inner annular object-end surface 215, wherein the inner object-endsurface 213 is disposed correspondingly to the outer object-end surface212. The protrusions 240 are disposed on the inner annular object-endsurface 215 and near the outer object-end surface 212. A number of theprotrusions 240 is greater than or equal to 80, and smaller than orequal to 800.

In FIG. 2A, an outer diameter of the object-end portion 210 is smallerthan an outer diameter of the image-end portion 220. Furthermore, theinner annular image-end surface 225 has an angle with the central axisof the plastic barrel 200, which is greater than 0 degrees and less than90 degrees. In other words, the inner annular image-end surface 225 isneither parallel nor orthogonal to the central axis of the plasticbarrel 200. Moreover, the inner tube portion 230 further includes aplurality of parallel surfaces 237 parallel to the central axis of theplastic barrel 200, wherein a number of the parallel surfaces 237 is atleast six.

In FIG. 2A, the object-end portion 210 further includes an outer annularobject-end surface 214, wherein the outer annular object-end surface 214is connected to the outer object-end surface 212 and surrounds theobject-end hole 211, and a distance between the outer annular object-endsurface 214 and the central axis is greater than a distance between theinner annular object-end surface 215 and the central axis. In FIG. 2Band FIG. 2C, the plastic barrel 200 further includes four gate traces250 disposed on the outer annular object-end surface 214 andsymmetrically around the central axis of the plastic barrel 200.

The data of the parameters w and h of the plastic barrel 200 accordingto the 2nd embodiment of the present disclosure are listed in thefollowing Table 2, wherein the parameters are also shown as FIG. 2C. Thedefinitions of these parameters shown in Table 2 are the same as thosestated in the 1st embodiment with corresponding values for the 2ndembodiment.

TABLE 2 2nd Embodiment w (mm) 0.03 h (mm) 0.02

3rd Embodiment

FIG. 3A is a schematic view of a plastic barrel 300 according to the 3rdembodiment of the present disclosure, and FIG. 3B shows a schematic viewof a plurality of protrusions 340 of the plastic barrel 300 according tothe 3rd embodiment. In FIG. 3A and FIG. 3B, the plastic barrel 300includes an object-end portion 310, an image-end portion 320, an innertube portion 330 and the protrusions 340.

The object-end portion 310 includes an outer object-end surface 312, anobject-end hole 311 and an inner annular object-end surface 315. Theouter object-end surface 312 is the surface of the plastic barrel 300facing an object (not shown). One side of the inner annular object-endsurface 315 is connected to the outer object-end surface 312 andsurrounds the object-end hole 311.

The image-end portion 320 includes an outer image-end surface 322, animage-end opening 321 and an inner annular image-end surface 325. Theouter image-end surface 322 is the surface of the plastic barrel 300facing an image surface (not shown). The inner annular image-end surface325 is connected to the outer image-end surface 322 and surrounds theimage-end opening 321.

The inner tube portion 330 connects the object-end portion 310 and theimage-end portion 320, wherein the inner tube portion 330 surrounds acentral axis of the plastic barrel 300 and faces the central axis. Theinner tube portion 330 includes a plurality of inclined surfaces 336,wherein each of the inclined surfaces 336 has an angle with the centralaxis, which is greater than 0 degrees and less than 90 degrees. In otherwords, each of the inclined surfaces 336 is neither parallel nororthogonal to the central axis of the plastic barrel 300.

In the 3rd embodiment, the protrusions 340 are disposed on the innerannular image-end surface 325 and the inner annular object-end surface315. The protrusions 340 disposed on the inner annular image-end surface325 are regularly arranged around the central axis of the plastic barrel300. Therefore, it is favorable for effectively attenuating thenon-imaging light reflected from the inner annular image-end surface 325so as to improve the image quality of the lens module. Furthermore, theinner annular image-end surface 325 has a circumferential directionaround the central axis of the plastic barrel 300, wherein theprotrusions 340 with the same geometric structures are disposed on theinner annular image-end surface 325, and regularly arranged with thesame spaces in the circumferential direction around the central axis ofthe plastic barrel 300.

In the 3rd embodiment, the inner annular image-end surface 325 has anangle with the central axis of the plastic barrel 300, which is greaterthan 0 degrees and less than 90 degrees. In other words, the innerannular image-end surface 325 is neither parallel nor orthogonal to thecentral axis of the plastic barrel 300. Therefore, it is favorable foreasily molding the protrusions 340 on the inner annular image-endsurface 325 so as to enhance the manufacturing yield rate.

The protrusions 340 disposed on the inner annular object-end surface 315are regularly arranged around the central axis of the plastic barrel300. In FIG. 3A, the object-end portion 310 further includes an innerobject-end surface 313 connected to the other side of the inner annularobject-end surface 315, wherein the inner object-end surface 313 isdisposed correspondingly to the outer object-end surface 312. Theprotrusions 340 are disposed on the inner annular object-end surface 315and near the outer object-end surface 312.

In the 3rd embodiment, the protrusions 340 and the plastic barrel 300are formed integrally. Furthermore, a number of the protrusions 340disposed on the inner annular image-end surface 325 is greater than orequal to 80, and smaller than or equal to 800.

In FIG. 3A, an outer diameter of the object-end portion 310 is smallerthan an outer diameter of the image-end portion 320. Moreover, the innertube portion 330 further includes a plurality of parallel surfaces 337parallel to the central axis of the plastic barrel 300, wherein a numberof the parallel surfaces 337 is at least six.

In the 3rd embodiment, the object-end portion 310 further includes anouter annular object-end surface 314, wherein the outer annularobject-end surface 314 is connected to the outer object-end surface 312and surrounds the object-end hole 311, and a distance between the outerannular object-end surface 314 and the central axis is greater than adistance between the inner annular object-end surface 315 and thecentral axis. Furthermore, the plastic barrel 300 further includes atleast two gate traces (not shown) disposed on the outer annularobject-end surface 314 and symmetrically around the central axis of theplastic barrel 300.

FIG. 3C shows a schematic view of the parameters w and h of the plasticbarrel 300 according to the 3rd embodiment. The data of the parameters wand h of the protrusions 340 disposed on the inner annular image-endsurface 325 of the plastic barrel 300 according to the 3rd embodiment ofthe present disclosure are listed in the following Table 3, wherein theparameters are also shown as FIG. 3C. The definitions of theseparameters shown in Table 3 are the same as those stated in the 1stembodiment with corresponding values for the 3rd embodiment.

TABLE 3 3rd Embodiment w (mm) 0.02 h (mm) 0.02

4th Embodiment

FIG. 4A is a schematic view of a plastic barrel 400 according to the 4thembodiment of the present disclosure, and FIG. 4B shows a schematic viewof a plurality of protrusions 440 of the plastic barrel 400 according tothe 4th embodiment. In FIG. 4A and FIG. 4B, the plastic barrel 400includes an object-end portion 410, an image-end portion 420, an innertube portion 430 and the protrusions 440.

The object-end portion 410 includes an outer object-end surface 412, anobject-end hole 411 and an inner annular object-end surface 415. Theouter object-end surface 412 is the surface of the plastic barrel 400facing an object (not shown). One side of the inner annular object-endsurface 415 is connected to the outer object-end surface 412 andsurrounds the object-end hole 411.

The image-end portion 420 includes an outer image-end surface 422, animage-end opening 421 and an inner annular image-end surface 425. Theouter image-end surface 422 is the surface of the plastic barrel 400facing an image surface (not shown). The inner annular image-end surface425 is connected to the outer image-end surface 422 and surrounds theimage-end opening 421.

The inner tube portion 430 connects the object-end portion 410 and theimage-end portion 420, wherein the inner tube portion 430 surrounds acentral axis of the plastic barrel 400 and faces the central axis. Theinner tube portion 430 includes a plurality of inclined surfaces 436,wherein each of the inclined surfaces 436 has an angle with the centralaxis, which is greater than 0 degrees and less than 90 degrees. In otherwords, each of the inclined surfaces 436 is neither parallel nororthogonal to the central axis of the plastic barrel 400.

In the 4th embodiment, the protrusions 440 are disposed on one of theinclined surfaces 436, the inner annular object-end surface 415 and theinner annular image-end surface 425. The protrusions 440 disposed on theone of the inclined surfaces 436 are regularly arranged around thecentral axis of the plastic barrel 400. Therefore, it is favorable foreffectively attenuating the non-imaging light reflected from theinclined surface 436 with the protrusions 440 so as to improve the imagequality of the lens module. Furthermore, the inclined surface 436 withthe protrusions 440 has a circumferential direction around the centralaxis of the plastic barrel 400, wherein the protrusions 440 with thesame geometric structures are disposed on the inclined surface 436, andregularly arranged with the same spaces in the circumferential directionaround the central axis of the plastic barrel 400.

The protrusions 440 disposed on the inner annular object-end surface 415are regularly arranged around the central axis of the plastic barrel400. In FIG. 4A, the object-end portion 410 further includes an innerobject-end surface 413 connected to the other side of the inner annularobject-end surface 415, wherein the inner object-end surface 413 isdisposed correspondingly to the outer object-end surface 412. Theprotrusions 440 are disposed on the inner annular object-end surface 415and near the outer object-end surface 412.

The protrusions 440 disposed on the inner annular image-end surface 425are regularly arranged around the central axis of the plastic barrel400. In FIG. 4A, the inner annular image-end surface 425 has an anglewith the central axis of the plastic barrel 400, which is greater than 0degrees and less than 90 degrees. In other words, the inner annularimage-end surface 425 is neither parallel nor orthogonal to the centralaxis of the plastic barrel 400.

In the 4th embodiment, the protrusions 440 and the plastic barrel 400are formed integrally. Furthermore, a number of the protrusions 440disposed on the one of the inclined surfaces 436 is greater than orequal to 80, and smaller than or equal to 800.

In FIG. 4A, an outer diameter of the object-end portion 410 is smallerthan an outer diameter of the image-end portion 420. Moreover, the innertube portion 430 further includes a plurality of parallel surfaces 437parallel to the central axis of the plastic barrel 400, wherein a numberof the parallel surfaces 437 is at least six.

In the 4th embodiment, the object-end portion 410 further includes anouter annular object-end surface 414, wherein the outer annularobject-end surface 414 is connected to the outer object-end surface 412and surrounds the object-end hole 411, and a distance between the outerannular object-end surface 414 and the central axis is greater than adistance between the inner annular object-end surface 415 and thecentral axis. Furthermore, the plastic barrel 400 further includes atleast two gate traces (not shown) disposed on the outer annularobject-end surface 414 and symmetrically around the central axis of theplastic barrel 400.

FIG. 4C shows a schematic view of the parameter w of the plastic barrel400 according to the 4th embodiment. The data of the parameters w and hof the protrusions 440 disposed on the inclined surface 436 of theplastic barrel 400 according to the 4th embodiment of the presentdisclosure are listed in the following Table 4, wherein the parametersare also shown as FIG. 4A and FIG. 4C. The definitions of theseparameters shown in Table 4 are the same as those stated in the 1stembodiment with corresponding values for the 4th embodiment.

TABLE 4 4th Embodiment w (mm) 0.03 h (mm) 0.04

5th Embodiment

FIG. 5A is a schematic view of a plastic barrel 500 according to the 5thembodiment of the present disclosure. In FIG. 5A, the plastic barrel 500includes an object-end portion 510, an image-end portion 520, an innertube portion 530 and the protrusions 540.

The object-end portion 510 includes an outer object-end surface 512, anobject-end hole 511 and an inner annular object-end surface 515. Theouter object-end surface 512 is the surface of the plastic barrel 500facing an object (not shown). One side of the inner annular object-endsurface 515 is connected to the outer object-end surface 512 andsurrounds the object-end hole 511.

The image-end portion 520 includes an outer image-end surface 522, animage-end opening 521 and an inner annular image-end surface 525. Theouter image-end surface 522 is the surface of the plastic barrel 500facing an image surface (not shown). The inner annular image-end surface525 is connected to the outer image-end surface 522 and surrounds theimage-end opening 521.

The inner tube portion 530 connects the object-end portion 510 and theimage-end portion 520, wherein the inner tube portion 530 surrounds acentral axis of the plastic barrel 500 and faces the central axis. Theinner tube portion 530 includes a plurality of inclined surfaces 536,wherein each of the inclined surfaces 536 has an angle with the centralaxis, which is greater than 0 degrees and less than 90 degrees. In otherwords, each of the inclined surfaces 536 is neither parallel nororthogonal to the central axis of the plastic barrel 500.

The protrusions 540 are disposed on two of the inclined surfaces 536,the inner annular object-end surface 515 and the inner annular image-endsurface 525. FIG. 5B shows a schematic view of the parameter w of theplastic barrel 500 according to the 5th embodiment. In FIG. 5A and FIG.5B, the protrusions 540 disposed on one of the inclined surfaces 536 areregularly arranged around the central axis of the plastic barrel 500. Indetails, the one of the inclined surfaces 536 has a circumferentialdirection around the central axis of the plastic barrel 500, wherein theprotrusions 540 with the same geometric structures are disposed on theone of the inclined surfaces 536. Two of the protrusions 540 are formedone set and regularly arranged in the circumferential direction aroundthe central axis of the plastic barrel 500, wherein the spaces betweentwo sets adjacent to each other are the same. Furthermore, theprotrusions 540 disposed on another of the inclined surfaces 536 areregularly arranged around the central axis of the plastic barrel 500.

The protrusions 540 disposed on the inner annular object-end surface 515are regularly arranged around the central axis of the plastic barrel500. In FIG. 5A, the object-end portion 510 further includes an innerobject-end surface 513 connected to the other side of the inner annularobject-end surface 515, wherein the inner object-end surface 513 isdisposed correspondingly to the outer object-end surface 512. Theprotrusions 540 are disposed on the inner annular object-end surface 515and near the outer object-end surface 512.

The protrusions 540 disposed on the inner annular image-end surface 525are regularly arranged around the central axis of the plastic barrel500. In FIG. 5A, the inner annular image-end surface 525 has an anglewith the central axis of the plastic barrel 500, which is greater than 0degrees and less than 90 degrees. In other words, the inner annularimage-end surface 525 is neither parallel nor orthogonal to the centralaxis of the plastic barrel 500.

In the 5th embodiment, the protrusions 540 and the plastic barrel 500are formed integrally. Furthermore, a number of the protrusions 540 onthe one of the inclined surfaces 536 is greater than or equal to 80, andsmaller than or equal to 800.

In FIG. 5A, an outer diameter of the object-end portion 510 is smallerthan an outer diameter of the image-end portion 520. Moreover, the innertube portion 530 further includes a plurality of parallel surfaces 537parallel to the central axis of the plastic barrel 500, wherein a numberof the parallel surfaces 537 is at least six.

In the 5th embodiment, the object-end portion 510 further includes anouter annular object-end surface 514, wherein the outer annularobject-end surface 514 is connected to the outer object-end surface 512and surrounds the object-end hole 511, and a distance between the outerannular object-end surface 514 and the central axis is greater than adistance between the inner annular object-end surface 515 and thecentral axis. Furthermore, the plastic barrel 500 further includes atleast two gate traces (not shown) disposed on the outer annularobject-end surface 514 and symmetrically around the central axis of theplastic barrel 500.

The data of the parameters w and h of the protrusions 540 disposed onthe one of the inclined surface 536 of the plastic barrel 500 accordingto the 5th embodiment of the present disclosure are listed in thefollowing Table 5, wherein the parameters are also shown as FIG. 5A andFIG. 5B. The definitions of these parameters shown in Table 5 are thesame as those stated in the 1st embodiment with corresponding values forthe 5th embodiment.

TABLE 5 5th Embodiment w (mm) 0.02 h (mm) 0.04

6th Embodiment

FIG. 6 shows a lens module 5000 according to the 6th embodiment of thepresent disclosure. In FIG. 6, the lens module 5000 includes the plasticbarrel 500 according to the 5th embodiment of the present disclosure andan optical lens assembly 5100.

The optical lens assembly 5100 is disposed in the plastic barrel 500 andincludes a plurality of lens elements (5101-5106).

In FIG. 5A and FIG. 6, the plastic barrel 500 includes the object-endportion 510, the image-end portion 520, the inner tube portion 530 andthe protrusions 540. The object-end portion 510 includes the outerobject-end surface 512, the object-end hole 511 and the inner annularobject-end surface 515. The image-end portion 520 includes the outerimage-end surface 522, the image-end opening 521 and the inner annularimage-end surface 525. The inner tube portion 530 includes the inclinedsurfaces 536.

In the 6th embodiment, the protrusions 540 are disposed on the innerannular object-end surface 515, the inner annular image-end surface 525and two of the inclined surfaces 536, wherein the protrusions 540 areregularly arranged around the central axis of the plastic barrel 500.Therefore, it is favorable for effectively attenuating the non-imaginglight reflected from the aforementioned surfaces so as to improve theimage quality of the lens module 5000.

Furthermore, the inner tube portion 530 further includes the parallelsurfaces 537 parallel to the central axis of the plastic barrel 500,wherein the number of the parallel surfaces 537 is at least six.Therefore, it is favorable for allowing the plastic barrel 500 to carrymore lens elements and avoiding the disorder among the lens elementsduring assembling. The other details of the plastic barrel 500 have beendescribed in the foregoing paragraphs and will not be described againherein.

Moreover, the object-end hole 511 can be an aperture stop of the opticallens assembly 5100. Therefore, it is favorable for reducing thecomplexity of mechanism design of the lens module 5000.

In details, the optical lens assembly 5100 includes, in order from theobject-end portion 510 of the plastic barrel 500 to the image-endportion 520 thereof, the first lens element 5101, the second lenselement 5102, the third lens element 5103, the fourth lens element 5104,the fifth lens element 5105 and the sixth lens element 5106, wherein thelens elements 5101-5106 are respectively abutted with a plurality ofoptical elements (its reference numeral is omitted) so as to be disposedin the plastic barrel 500.

7th Embodiment

FIG. 7 shows an electronic device 10 according to the 7th embodiment ofthe present disclosure. The electronic device 10 of the 7th embodimentis a smart phone, wherein the electronic device 10 includes a lensmodule 1000, and the lens module 1000 includes a plastic barrel (notshown) according to the present disclosure. Therefore, it is favorablefor effectively attenuating the non-imaging light so as to improve theimage quality and satisfy the requirements of high-end electronicdevices with camera functionalities. Furthermore, the electronic device10 can further include an image sensor disposed on or near an imagesurface of the lens module 1000. Preferably, the electronic device 10can further include but not limited to a display, a control unit, astorage unit, a random access memory unit (RAM), a read-only memory unit(ROM) or a combination thereof.

8th Embodiment

FIG. 8 shows an electronic device 20 according to the 8th embodiment ofthe present disclosure. The electronic device 20 of the 8th embodimentis a tablet personal computer, wherein the electronic device 20 includesa lens module 2000, and the lens module 2000 includes a plastic barrel(not shown) according to the present disclosure.

9th Embodiment

FIG. 9 shows an electronic device 30 according to the 9th embodiment ofthe present disclosure. The electronic device 30 of the 9th embodimentis a wearable device, wherein the electronic device 30 includes a lensmodule 3000, and the lens module 3000 includes a plastic barrel (notshown) according to the present disclosure.

Although the present disclosure has been described in considerabledetail with reference to the embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the presentdisclosure. In view of the foregoing, it is intended that the presentdisclosure cover modifications and variations of this disclosureprovided they fall within the scope of the following claims.

What is claimed is:
 1. A plastic barrel, which is for holding at leastone lens element, comprising: an object-end portion, comprising: anobject-end hole; an image-end portion; an inner tube portion connectingthe object-end portion and the image-end portion, and comprising: aplurality of inclined surfaces, wherein each of the inclined surfaceshas an angle with a central axis of the plastic barrel; and a pluralityof protrusions disposed on the object-end portion, wherein theprotrusions are regularly arranged around the object-end hole of theplastic barrel, each of the protrusions is strip-shaped and extends awayfrom the object-end hole, and each of the protrusions does not havecontact with the at least one lens element; wherein the protrusions andthe plastic barrel are formed integrally, and a number of theprotrusions is greater than or equal to 80, and smaller than or equal to800.
 2. The plastic barrel of claim 1, wherein a width of each of theprotrusions in a circumferential direction of the plastic barrel is w,and the following condition is satisfied:0.01 mm<w<0.05 mm.
 3. The plastic barrel of claim 1, wherein a height ofeach of the protrusions is h, and the following condition is satisfied:0.01 mm<h<0.06 mm.
 4. The plastic barrel of claim 1, wherein the innertube portion further comprises: a plurality of parallel surfacesparallel to the central axis of the plastic barrel, wherein a number ofthe parallel surfaces is at least six.
 5. The plastic barrel of claim 1,wherein an outer diameter of the object-end portion is smaller than anouter diameter of the image-end portion.
 6. The plastic barrel of claim1, further comprising: at least two gate traces symmetrically disposedaround the central axis of the plastic barrel.
 7. A lens module,comprising: the plastic barrel of claim 1; and an optical lens assemblydisposed in the plastic barrel and comprising a plurality of lenselements.
 8. The lens module of claim 7, wherein the object-end hole isan aperture stop of the optical lens assembly.
 9. An electronic device,comprising: the lens module of claim 7.